<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>2215-3896</journal-id>
<journal-title><![CDATA[Revista de Ciencias Ambientales]]></journal-title>
<abbrev-journal-title><![CDATA[Ciencias Ambientales]]></abbrev-journal-title>
<issn>2215-3896</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S2215-38962022000200063</article-id>
<article-id pub-id-type="doi">10.15359/rca.56/2.4</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Curvas de altura dominante e índice de sitio locales para plantaciones de Samanea saman en Liberia, Guanacaste, Costa Rica]]></article-title>
<article-title xml:lang="en"><![CDATA[Dominant height and local site index curves for Samanea saman plantations in Liberia, Guanacaste, Costa Rica]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Mora-Chacón]]></surname>
<given-names><![CDATA[Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Meza-Picado]]></surname>
<given-names><![CDATA[Víctor]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Chinchilla-Mora]]></surname>
<given-names><![CDATA[Orlando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Gutiérrez-Leitón]]></surname>
<given-names><![CDATA[Milena]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional (UNA)  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Nacional (UNA) Instituto de Investigación y Servicios Forestales ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Nacional (UNA) Instituto de Investigación y Servicios Forestales ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<aff id="Af4">
<institution><![CDATA[,Sistema Nacional Áreas de Conservación Estación Experimental Forestal Horizontes ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
<country>Costa Rica</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2022</year>
</pub-date>
<volume>56</volume>
<numero>2</numero>
<fpage>63</fpage>
<lpage>80</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_arttext&amp;pid=S2215-38962022000200063&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_abstract&amp;pid=S2215-38962022000200063&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.sa.cr/scielo.php?script=sci_pdf&amp;pid=S2215-38962022000200063&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen  (Introducción): La investigación a largo plazo sobre el crecimiento y el rendimiento maderable de las plantaciones con especies forestales nativas del bosque seco tropical es escasa, a pesar de que en muchas de estas especies se reconoce un verdadero potencial para la producción comercial de madera.  (Objetivo): Construir un sistema de clasificación de la productividad basado en el crecimiento de la altura dominante e índices de sitio locales para Samanea saman con el fin de facilitar los trabajos de manejo técnico de esta especie nativa en el bosque seco tropical de Liberia, Costa Rica.  (Metodología):  Los datos altura dominante-edad, utilizados para construir las curvas de altura dominante e índice de sitio, se obtuvieron de parcelas permanentes, las cuales fueron medidas anualmente durante 21 años. Se probaron ocho modelos de regresión utilizados en la literatura forestal, los cuales fueron evaluados estadísticamente y se graficaron los valores estimados versus los observados, con el fin de analizar gráficamente, el comportamiento de los datos.  (Resultados):  El modelo más satisfactorio fue el de Prodan con R  2 adj de 93.72 %, CME = 3.9706, EEE = 1.9926 y EMA = 1.4830 para un valor-P de (0.00001) a un nivel de confianza del 95 %. La curva promedio ajustada por el modelo de Prodan (1951), al inicio presenta una inclinación que sugiere un crecimiento inicial rápido, con una primera sección de la curva que se levanta rápidamente hasta la edad de 8 años; luego, una segunda sección entre las edades de 9 y 14 años, donde continúa creciendo, pero con una tasa de incremento menor.  (Conclusiones): El modelo de Prodan presentó la mejor calidad de ajuste. El sistema de clasificación de la productividad propuesto tomó como edad base 15 años para construir las curvas que corresponden a los índices de sitio 9, 12, 15 y 18, los cuales abarcan todo el intervalo de calidad de sitios observado.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract  (Introduction):  Long-term research on the growth and timber yield of plantations with forest species native to tropical dry forest is scarce, despide the fact that many of these species a real potential for commercial timber production is recognized.  (Objective):  Build a local classification system based on the growth of dominant height for Samanea saman by using site index curves, to facilitate management works with this native species in the tropical dry forest of Liberia, Costa Rica.  (Methodology):  The dominant height-age data, used to construct the dominant height and site index curves, were obtained from permanent plots, which were measured annually for 21 years. Eight regression models used in the forest literature were tested. The models were statistically analyzed; in addition, the estimated values were plotted versus the observed values to graphically evaluate the fit of the data.  (Results):  The most satisfactory model was that of Prodan (1951) with R  2 adj of 93.72 %, MSE = 3.9706, SEE = 1.9926 and MAE = 1.4830 for a P-value of (0.00001) at a confidence level of 95 %. The average curve adjusted by the Prodan model at first presents an inclination that suggests a rapid initial growth, with a first section of the curve that rises quickly until the age of 8; then, a second section between the ages of 9 and 14, where it continues to grow with a lower rate.  (Conclusions):  The Prodan model has an appropriate fit for permanent plot data. The proposed classification system took as its base age 15 years to construct the curves corresponding to site indices 9, 12, 15 and 18, which cover the entire observed site quality range.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[bosque seco tropical]]></kwd>
<kwd lng="es"><![CDATA[calidad de sitio]]></kwd>
<kwd lng="es"><![CDATA[crecimiento en altura]]></kwd>
<kwd lng="es"><![CDATA[monitoreo del crecimiento]]></kwd>
<kwd lng="es"><![CDATA[parcelas permanentes]]></kwd>
<kwd lng="es"><![CDATA[productividad forestal]]></kwd>
<kwd lng="en"><![CDATA[site quality]]></kwd>
<kwd lng="en"><![CDATA[height growth]]></kwd>
<kwd lng="en"><![CDATA[permanent plots]]></kwd>
<kwd lng="en"><![CDATA[growth monitoring]]></kwd>
<kwd lng="en"><![CDATA[dry forest]]></kwd>
<kwd lng="en"><![CDATA[forest productivity.]]></kwd>
</kwd-group>
</article-meta>
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